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“We have given guidance that to protect yourself and others you could choose to wear a face covering.

“You should be taking precautions like social distancing if you can – I appreciate that isn’t always possible and some of the scenes… show buses and Tubes too full to be able to sit two metres apart and that’s a problem.

“That’s one of the reasons why we are trying to encourage as many people as can to drive to work – if they have a car – or to walk or cycle.”